Advil is a brand name for the drug ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce fever [1]. Antacids are medications used to neutralize stomach acid and relieve symptoms of heartburn, acid reflux, and indigestion [2].

According to a study published in the Journal of Clinical Pharmacology, taking antacids with ibuprofen can decrease the absorption of ibuprofen in the body [2]. This can result in decreased effectiveness of ibuprofen in relieving pain and reducing fever. However, the study also found that taking antacids two hours before or after taking ibuprofen did not affect the absorption of the drug [2].

Therefore, it is generally recommended to take ibuprofen and antacids at least two hours apart to avoid any potential interactions [3]. However, it is important to consult with a healthcare professional before taking any medications together, especially if you have any underlying medical conditions or are taking other medications [3].

In conclusion, while it is generally safe to take Advil (ibuprofen) and antacids together, it is recommended to take them at least two hours apart to avoid any potential interactions. It is important to consult with a healthcare professional before taking any medications together.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://pubmed.ncbi.nlm.nih.gov/18280125/
[3] https://greengablespa.com/is-it-safe-to-take-antacid-with-ibuprofen/